Adsorbents based on crown ether functionalized composite mesoporous silica for selective extraction of trace silver

Hong, Mingzhu; Wang, Xiu; You, Weijie; Zhuang, Zanyong; Yu, Yan

doi:10.1016/j.cej.2016.11.030

Cited by 40 publications

(12 citation statements)

References 42 publications

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“…16−19 Many adsorbents have been employed for successful removal of metal ions from aqueous solution such as mesoporous carbon, 20 biomass, 21 zeolite, 22 cellulose, 23 magnetic composite, 24 and silica gel. 25…”

Section: Introductionmentioning

confidence: 99%

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

et al. 2019

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Efficient materials capable of capturing toxic metals from water are widely needed. Herein, a new pyridylpyrazole-β-ketoenol receptor, X-ray diffraction analyzed, was covalently incorporated into the silica surface to produce solid and recyclable adsorbent particles. The new material, fully characterized, revealed extremely efficient removal of toxic metals from water, with a selectivity order of Pb(II) > Zn(II) > Cu(II) > Cd(II). The adsorption was exceptionally rapid at optimum pH and concentrations, showing Pb(II) removal of 93 mg g –1 within 5 min and maximum Pb(II) adsorption of 110 mg g –1 after only 20 min. Sorption isotherms agreed well with the Langmuir model suggesting a monolayer adsorption, whereas kinetics agreed with the pseudo-second-order model suggesting a chemisorption binding mechanism. Thermodynamics of adsorption were fitted with an endothermic and spontaneous process. The material, recyclable for at least five cycles, is therefore promising for the cleanup of water polluted by toxic metals, especially lead.

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Section: Introductionmentioning

confidence: 99%

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

et al. 2019

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“…There are various treatment methods for heavy metal removal, such as adsorption, ion exchange, membrane filtration, electrodialysis, and so on 1–3,5–10 . Among them, the adsorption method has some advantages such as high efficiency, low cost, and easy operation 3–7,9 . The materials used as adsorbents are minerals, zeolite, an industrial by‐product, and agricultural waste.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of thermoresponsive copolymer/silica‐coated magnetite nanoparticle composite and its application for heavy metal ion recovery

Tomonaga

Hayashi

Matsuyama

et al. 2020

J of Applied Polymer Sci

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To enhance chemical stability and suppress of aggregation of magnetite nanoparticles (MNPs), which are used as a support for thermoresponsive copolymer immobilization, silica coating of the MNPs is applied via the electrooxidation method. Although the resulting silica coated-MNPs also formed aggregates, the size distribution of the aggregate shifted to smaller size range. Because of that, the surface area available for copolymer immobilization increased approximately 6.7 times at maximum as compared with that of the uncoated MNPs. It contributed to the increase of the amount of the immobilized copolymer on the silica-coated MNPs, which is approximately four times larger than that on the uncoated MNPs. Fe 3 O 4 dissolution test confirmed enhancement of chemical stability of MNPs. The thermoresponsive copolymer immobilized on the silica-coated MNPs shows the ability to recycle Cu(II) ion from Cu(II) containing solution by changing temperature with significantly shorter time than those in other thermoresponsive adsorbents in gel form.

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“…For example, Hong et al . prepared adsorbents based on crown ether functionalized mesoporous silica to selectively adsorb trace‐level Ag(I) using dibenzo‐18‐crown‐6 as functional monomer . Liu et al .…”

Section: Introductionmentioning

confidence: 99%

“…In particular, crown ethers, which are composed of cyclic ethyleneglycol ((OCH 2 CH 2 ) n ), have selective binding ability with alkali metal ions, heavy metal ions and rare earth metal ions which possess similar size with the ring of them, due to their unique chemical structure. So, numerous applications are brought to crown ethers, such as ion‐selectivity sensors, phase transfer catalyst, and ion adsorption …”

Section: Introductionmentioning

confidence: 99%

Simultaneous adsorption of Li(I) and Rb(I) by dual crown ethers modified magnetic ion imprinting polymers

et al. 2019

Applied Organom Chemis

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With the gradual exhaustion of land mineral resources, oceans and lakes have attracted world attention because they are abundant in inorganic mineral resources including lithium, potassium, rubidium and cesium. Lithium is becoming the key material in manufacturing of primary and secondary batteries used in various portable devices and hybrid/electric vehicles. Rubidium has been widely applied inglobal positioning satellites, magneto‐optic modulators, solid‐state lasers, phosphors, and glass manufacturing. In this work, a novel dual‐functional magnetic ion imprinting polymer (Fe3O4@SiO2@IIPs) powder was prepared using 12‐crown‐4 (12C4) and 18‐crown‐6 (18C6) as functional monomer, and characterized by FT‐IR, elemental analysis, XRD, TGA, SEM and TEM. The adsorption performance of Fe3O4@SiO2@IIPs for simultaneous adsorption of lithium and rubidium from simulative salt lakes was evaluated by batches of experiments at various pH values, contact time, and initial concentrations. Kinetic experiments show that the adsorption process followed the pseudo second order kinetic model. Langmuir adsorption isotherm model and Freundlich adsorption equilibrium data were fitted; the results show that Langmuir isotherm model is more suitable for the adsorption process. Additionally, Fe3O4@SiO2@IIPs exhibit specificity towards Li(I) and Rb(I) and low competitive behavior with Na(I), K(I) and Mg (II). Additionally, the selectivity properties, reusability and adsorption thermodynamic were also investigated. The obtained results show that the prepared Fe3O4@SiO2@IIPs material remains high adsorption capacities after five cycles, exhibits excellent abilities to simultaneously and selectively recover Li+ and Rb+ and have a promising application in the simultaneous adsorption of lithium and rubidium ions.

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Adsorbents based on crown ether functionalized composite mesoporous silica for selective extraction of trace silver

Cited by 40 publications

References 42 publications

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

Highly Selective Removal of Pb(II) by a Pyridylpyrazole-β-ketoenol Receptor Covalently Bonded onto the Silica Surface

Synthesis of thermoresponsive copolymer/silica‐coated magnetite nanoparticle composite and its application for heavy metal ion recovery

Simultaneous adsorption of Li(I) and Rb(I) by dual crown ethers modified magnetic ion imprinting polymers

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